/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.springframework.asm;

/**
 * A visitor to visit a Java method. The methods of this class must be called in
 * the following order: ( <tt>visitParameter</tt> )* [
 * <tt>visitAnnotationDefault</tt> ] ( <tt>visitAnnotation</tt> |
 * <tt>visitParameterAnnotation</tt> <tt>visitTypeAnnotation</tt> |
 * <tt>visitAttribute</tt> )* [ <tt>visitCode</tt> ( <tt>visitFrame</tt> |
 * <tt>visit<i>X</i>Insn</tt> | <tt>visitLabel</tt> |
 * <tt>visitInsnAnnotation</tt> | <tt>visitTryCatchBlock</tt> |
 * <tt>visitTryCatchAnnotation</tt> | <tt>visitLocalVariable</tt> |
 * <tt>visitLocalVariableAnnotation</tt> | <tt>visitLineNumber</tt> )*
 * <tt>visitMaxs</tt> ] <tt>visitEnd</tt>. In addition, the
 * <tt>visit<i>X</i>Insn</tt> and <tt>visitLabel</tt> methods must be called in
 * the sequential order of the bytecode instructions of the visited code,
 * <tt>visitInsnAnnotation</tt> must be called <i>after</i> the annotated
 * instruction, <tt>visitTryCatchBlock</tt> must be called <i>before</i> the
 * labels passed as arguments have been visited,
 * <tt>visitTryCatchBlockAnnotation</tt> must be called <i>after</i> the
 * corresponding try catch block has been visited, and the
 * <tt>visitLocalVariable</tt>, <tt>visitLocalVariableAnnotation</tt> and
 * <tt>visitLineNumber</tt> methods must be called <i>after</i> the labels
 * passed as arguments have been visited.
 *
 * @author Eric Bruneton
 */
public abstract class MethodVisitor {

	/**
	 * The ASM API version implemented by this visitor. The value of this field
	 * must be one of {@link Opcodes#ASM4}, {@link Opcodes#ASM5} or {@link Opcodes#ASM6}.
	 */
	protected final int api;

	/**
	 * The method visitor to which this visitor must delegate method calls. May
	 * be null.
	 */
	protected MethodVisitor mv;

	/**
	 * Constructs a new {@link MethodVisitor}.
	 *
	 * @param api the ASM API version implemented by this visitor. Must be one
	 *            of {@link Opcodes#ASM4}, {@link Opcodes#ASM5} or {@link Opcodes#ASM6}.
	 */
	public MethodVisitor(final int api) {
		this(api, null);
	}

	/**
	 * Constructs a new {@link MethodVisitor}.
	 *
	 * @param api the ASM API version implemented by this visitor. Must be one
	 *            of {@link Opcodes#ASM4}, {@link Opcodes#ASM5} or {@link Opcodes#ASM6}.
	 * @param mv  the method visitor to which this visitor must delegate method
	 *            calls. May be null.
	 */
	public MethodVisitor(final int api, final MethodVisitor mv) {
		if (api < Opcodes.ASM4 || api > Opcodes.ASM6) {
			throw new IllegalArgumentException();
		}
		this.api = api;
		this.mv = mv;
	}

	// -------------------------------------------------------------------------
	// Parameters, annotations and non standard attributes
	// -------------------------------------------------------------------------

	/**
	 * Visits a parameter of this method.
	 *
	 * @param name   parameter name or null if none is provided.
	 * @param access the parameter's access flags, only <tt>ACC_FINAL</tt>,
	 *               <tt>ACC_SYNTHETIC</tt> or/and <tt>ACC_MANDATED</tt> are
	 *               allowed (see {@link Opcodes}).
	 */
	public void visitParameter(String name, int access) {
		/* SPRING PATCH: REMOVED FOR COMPATIBILITY WITH CGLIB 3.1
        if (api < Opcodes.ASM5) {
            throw new RuntimeException();
        }
        */
		if (mv != null) {
			mv.visitParameter(name, access);
		}
	}

	/**
	 * Visits the default value of this annotation interface method.
	 *
	 * @return a visitor to the visit the actual default value of this
	 * annotation interface method, or <tt>null</tt> if this visitor is
	 * not interested in visiting this default value. The 'name'
	 * parameters passed to the methods of this annotation visitor are
	 * ignored. Moreover, exacly one visit method must be called on this
	 * annotation visitor, followed by visitEnd.
	 */
	public AnnotationVisitor visitAnnotationDefault() {
		if (mv != null) {
			return mv.visitAnnotationDefault();
		}
		return null;
	}

	/**
	 * Visits an annotation of this method.
	 *
	 * @param desc    the class descriptor of the annotation class.
	 * @param visible <tt>true</tt> if the annotation is visible at runtime.
	 * @return a visitor to visit the annotation values, or <tt>null</tt> if
	 * this visitor is not interested in visiting this annotation.
	 */
	public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
		if (mv != null) {
			return mv.visitAnnotation(desc, visible);
		}
		return null;
	}

	/**
	 * Visits an annotation on a type in the method signature.
	 *
	 * @param typeRef  a reference to the annotated type. The sort of this type
	 *                 reference must be {@link TypeReference#METHOD_TYPE_PARAMETER
	 *                 METHOD_TYPE_PARAMETER},
	 *                 {@link TypeReference#METHOD_TYPE_PARAMETER_BOUND
	 *                 METHOD_TYPE_PARAMETER_BOUND},
	 *                 {@link TypeReference#METHOD_RETURN METHOD_RETURN},
	 *                 {@link TypeReference#METHOD_RECEIVER METHOD_RECEIVER},
	 *                 {@link TypeReference#METHOD_FORMAL_PARAMETER
	 *                 METHOD_FORMAL_PARAMETER} or {@link TypeReference#THROWS
	 *                 THROWS}. See {@link TypeReference}.
	 * @param typePath the path to the annotated type argument, wildcard bound, array
	 *                 element type, or static inner type within 'typeRef'. May be
	 *                 <tt>null</tt> if the annotation targets 'typeRef' as a whole.
	 * @param desc     the class descriptor of the annotation class.
	 * @param visible  <tt>true</tt> if the annotation is visible at runtime.
	 * @return a visitor to visit the annotation values, or <tt>null</tt> if
	 * this visitor is not interested in visiting this annotation.
	 */
	public AnnotationVisitor visitTypeAnnotation(int typeRef,
												 TypePath typePath, String desc, boolean visible) {
		/* SPRING PATCH: REMOVED FOR COMPATIBILITY WITH CGLIB 3.1
        if (api < Opcodes.ASM5) {
            throw new RuntimeException();
        }
        */
		if (mv != null) {
			return mv.visitTypeAnnotation(typeRef, typePath, desc, visible);
		}
		return null;
	}

	/**
	 * Visits an annotation of a parameter this method.
	 *
	 * @param parameter the parameter index.
	 * @param desc      the class descriptor of the annotation class.
	 * @param visible   <tt>true</tt> if the annotation is visible at runtime.
	 * @return a visitor to visit the annotation values, or <tt>null</tt> if
	 * this visitor is not interested in visiting this annotation.
	 */
	public AnnotationVisitor visitParameterAnnotation(int parameter,
													  String desc, boolean visible) {
		if (mv != null) {
			return mv.visitParameterAnnotation(parameter, desc, visible);
		}
		return null;
	}

	/**
	 * Visits a non standard attribute of this method.
	 *
	 * @param attr an attribute.
	 */
	public void visitAttribute(Attribute attr) {
		if (mv != null) {
			mv.visitAttribute(attr);
		}
	}

	/**
	 * Starts the visit of the method's code, if any (i.e. non abstract method).
	 */
	public void visitCode() {
		if (mv != null) {
			mv.visitCode();
		}
	}

	/**
	 * Visits the current state of the local variables and operand stack
	 * elements. This method must(*) be called <i>just before</i> any
	 * instruction <b>i</b> that follows an unconditional branch instruction
	 * such as GOTO or THROW, that is the target of a jump instruction, or that
	 * starts an exception handler block. The visited types must describe the
	 * values of the local variables and of the operand stack elements <i>just
	 * before</i> <b>i</b> is executed.<br>
	 * <br>
	 * (*) this is mandatory only for classes whose version is greater than or
	 * equal to {@link Opcodes#V1_6 V1_6}. <br>
	 * <br>
	 * The frames of a method must be given either in expanded form, or in
	 * compressed form (all frames must use the same format, i.e. you must not
	 * mix expanded and compressed frames within a single method):
	 * <ul>
	 * <li>In expanded form, all frames must have the F_NEW type.</li>
	 * <li>In compressed form, frames are basically "deltas" from the state of
	 * the previous frame:
	 * <ul>
	 * <li>{@link Opcodes#F_SAME} representing frame with exactly the same
	 * locals as the previous frame and with the empty stack.</li>
	 * <li>{@link Opcodes#F_SAME1} representing frame with exactly the same
	 * locals as the previous frame and with single value on the stack (
	 * <code>nStack</code> is 1 and <code>stack[0]</code> contains value for the
	 * type of the stack item).</li>
	 * <li>{@link Opcodes#F_APPEND} representing frame with current locals are
	 * the same as the locals in the previous frame, except that additional
	 * locals are defined (<code>nLocal</code> is 1, 2 or 3 and
	 * <code>local</code> elements contains values representing added types).</li>
	 * <li>{@link Opcodes#F_CHOP} representing frame with current locals are the
	 * same as the locals in the previous frame, except that the last 1-3 locals
	 * are absent and with the empty stack (<code>nLocals</code> is 1, 2 or 3).</li>
	 * <li>{@link Opcodes#F_FULL} representing complete frame data.</li>
	 * </ul>
	 * </li>
	 * </ul>
	 * <br>
	 * In both cases the first frame, corresponding to the method's parameters
	 * and access flags, is implicit and must not be visited. Also, it is
	 * illegal to visit two or more frames for the same code location (i.e., at
	 * least one instruction must be visited between two calls to visitFrame).
	 *
	 * @param type   the type of this stack map frame. Must be
	 *               {@link Opcodes#F_NEW} for expanded frames, or
	 *               {@link Opcodes#F_FULL}, {@link Opcodes#F_APPEND},
	 *               {@link Opcodes#F_CHOP}, {@link Opcodes#F_SAME} or
	 *               {@link Opcodes#F_APPEND}, {@link Opcodes#F_SAME1} for
	 *               compressed frames.
	 * @param nLocal the number of local variables in the visited frame.
	 * @param local  the local variable types in this frame. This array must not be
	 *               modified. Primitive types are represented by
	 *               {@link Opcodes#TOP}, {@link Opcodes#INTEGER},
	 *               {@link Opcodes#FLOAT}, {@link Opcodes#LONG},
	 *               {@link Opcodes#DOUBLE},{@link Opcodes#NULL} or
	 *               {@link Opcodes#UNINITIALIZED_THIS} (long and double are
	 *               represented by a single element). Reference types are
	 *               represented by String objects (representing internal names),
	 *               and uninitialized types by Label objects (this label
	 *               designates the NEW instruction that created this uninitialized
	 *               value).
	 * @param nStack the number of operand stack elements in the visited frame.
	 * @param stack  the operand stack types in this frame. This array must not be
	 *               modified. Its content has the same format as the "local"
	 *               array.
	 * @throws IllegalStateException if a frame is visited just after another one, without any
	 *                               instruction between the two (unless this frame is a
	 *                               Opcodes#F_SAME frame, in which case it is silently ignored).
	 */
	public void visitFrame(int type, int nLocal, Object[] local, int nStack,
						   Object[] stack) {
		if (mv != null) {
			mv.visitFrame(type, nLocal, local, nStack, stack);
		}
	}

	// -------------------------------------------------------------------------
	// Normal instructions
	// -------------------------------------------------------------------------

	/**
	 * Visits a zero operand instruction.
	 *
	 * @param opcode the opcode of the instruction to be visited. This opcode is
	 *               either NOP, ACONST_NULL, ICONST_M1, ICONST_0, ICONST_1,
	 *               ICONST_2, ICONST_3, ICONST_4, ICONST_5, LCONST_0, LCONST_1,
	 *               FCONST_0, FCONST_1, FCONST_2, DCONST_0, DCONST_1, IALOAD,
	 *               LALOAD, FALOAD, DALOAD, AALOAD, BALOAD, CALOAD, SALOAD,
	 *               IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE,
	 *               SASTORE, POP, POP2, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1,
	 *               DUP2_X2, SWAP, IADD, LADD, FADD, DADD, ISUB, LSUB, FSUB, DSUB,
	 *               IMUL, LMUL, FMUL, DMUL, IDIV, LDIV, FDIV, DDIV, IREM, LREM,
	 *               FREM, DREM, INEG, LNEG, FNEG, DNEG, ISHL, LSHL, ISHR, LSHR,
	 *               IUSHR, LUSHR, IAND, LAND, IOR, LOR, IXOR, LXOR, I2L, I2F, I2D,
	 *               L2I, L2F, L2D, F2I, F2L, F2D, D2I, D2L, D2F, I2B, I2C, I2S,
	 *               LCMP, FCMPL, FCMPG, DCMPL, DCMPG, IRETURN, LRETURN, FRETURN,
	 *               DRETURN, ARETURN, RETURN, ARRAYLENGTH, ATHROW, MONITORENTER,
	 *               or MONITOREXIT.
	 */
	public void visitInsn(int opcode) {
		if (mv != null) {
			mv.visitInsn(opcode);
		}
	}

	/**
	 * Visits an instruction with a single int operand.
	 *
	 * @param opcode  the opcode of the instruction to be visited. This opcode is
	 *                either BIPUSH, SIPUSH or NEWARRAY.
	 * @param operand the operand of the instruction to be visited.<br>
	 *                When opcode is BIPUSH, operand value should be between
	 *                Byte.MIN_VALUE and Byte.MAX_VALUE.<br>
	 *                When opcode is SIPUSH, operand value should be between
	 *                Short.MIN_VALUE and Short.MAX_VALUE.<br>
	 *                When opcode is NEWARRAY, operand value should be one of
	 *                {@link Opcodes#T_BOOLEAN}, {@link Opcodes#T_CHAR},
	 *                {@link Opcodes#T_FLOAT}, {@link Opcodes#T_DOUBLE},
	 *                {@link Opcodes#T_BYTE}, {@link Opcodes#T_SHORT},
	 *                {@link Opcodes#T_INT} or {@link Opcodes#T_LONG}.
	 */
	public void visitIntInsn(int opcode, int operand) {
		if (mv != null) {
			mv.visitIntInsn(opcode, operand);
		}
	}

	/**
	 * Visits a local variable instruction. A local variable instruction is an
	 * instruction that loads or stores the value of a local variable.
	 *
	 * @param opcode the opcode of the local variable instruction to be visited.
	 *               This opcode is either ILOAD, LLOAD, FLOAD, DLOAD, ALOAD,
	 *               ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET.
	 * @param var    the operand of the instruction to be visited. This operand is
	 *               the index of a local variable.
	 */
	public void visitVarInsn(int opcode, int var) {
		if (mv != null) {
			mv.visitVarInsn(opcode, var);
		}
	}

	/**
	 * Visits a type instruction. A type instruction is an instruction that
	 * takes the internal name of a class as parameter.
	 *
	 * @param opcode the opcode of the type instruction to be visited. This opcode
	 *               is either NEW, ANEWARRAY, CHECKCAST or INSTANCEOF.
	 * @param type   the operand of the instruction to be visited. This operand
	 *               must be the internal name of an object or array class (see
	 *               {@link Type#getInternalName() getInternalName}).
	 */
	public void visitTypeInsn(int opcode, String type) {
		if (mv != null) {
			mv.visitTypeInsn(opcode, type);
		}
	}

	/**
	 * Visits a field instruction. A field instruction is an instruction that
	 * loads or stores the value of a field of an object.
	 *
	 * @param opcode the opcode of the type instruction to be visited. This opcode
	 *               is either GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD.
	 * @param owner  the internal name of the field's owner class (see
	 *               {@link Type#getInternalName() getInternalName}).
	 * @param name   the field's name.
	 * @param desc   the field's descriptor (see {@link Type Type}).
	 */
	public void visitFieldInsn(int opcode, String owner, String name,
							   String desc) {
		if (mv != null) {
			mv.visitFieldInsn(opcode, owner, name, desc);
		}
	}

	/**
	 * Visits a method instruction. A method instruction is an instruction that
	 * invokes a method.
	 *
	 * @param opcode the opcode of the type instruction to be visited. This opcode
	 *               is either INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or
	 *               INVOKEINTERFACE.
	 * @param owner  the internal name of the method's owner class (see
	 *               {@link Type#getInternalName() getInternalName}).
	 * @param name   the method's name.
	 * @param desc   the method's descriptor (see {@link Type Type}).
	 */
	@Deprecated
	public void visitMethodInsn(int opcode, String owner, String name,
								String desc) {
		if (api >= Opcodes.ASM5) {
			boolean itf = opcode == Opcodes.INVOKEINTERFACE;
			visitMethodInsn(opcode, owner, name, desc, itf);
			return;
		}
		if (mv != null) {
			mv.visitMethodInsn(opcode, owner, name, desc);
		}
	}

	/**
	 * Visits a method instruction. A method instruction is an instruction that
	 * invokes a method.
	 *
	 * @param opcode the opcode of the type instruction to be visited. This opcode
	 *               is either INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or
	 *               INVOKEINTERFACE.
	 * @param owner  the internal name of the method's owner class (see
	 *               {@link Type#getInternalName() getInternalName}).
	 * @param name   the method's name.
	 * @param desc   the method's descriptor (see {@link Type Type}).
	 * @param itf    if the method's owner class is an interface.
	 */
	public void visitMethodInsn(int opcode, String owner, String name,
								String desc, boolean itf) {
		if (api < Opcodes.ASM5) {
			if (itf != (opcode == Opcodes.INVOKEINTERFACE)) {
				throw new IllegalArgumentException(
						"INVOKESPECIAL/STATIC on interfaces require ASM 5");
			}
			visitMethodInsn(opcode, owner, name, desc);
			return;
		}
		if (mv != null) {
			mv.visitMethodInsn(opcode, owner, name, desc, itf);
		}
	}

	/**
	 * Visits an invokedynamic instruction.
	 *
	 * @param name    the method's name.
	 * @param desc    the method's descriptor (see {@link Type Type}).
	 * @param bsm     the bootstrap method.
	 * @param bsmArgs the bootstrap method constant arguments. Each argument must be
	 *                an {@link Integer}, {@link Float}, {@link Long},
	 *                {@link Double}, {@link String}, {@link Type} or {@link Handle}
	 *                value. This method is allowed to modify the content of the
	 *                array so a caller should expect that this array may change.
	 */
	public void visitInvokeDynamicInsn(String name, String desc, Handle bsm,
									   Object... bsmArgs) {
		if (mv != null) {
			mv.visitInvokeDynamicInsn(name, desc, bsm, bsmArgs);
		}
	}

	/**
	 * Visits a jump instruction. A jump instruction is an instruction that may
	 * jump to another instruction.
	 *
	 * @param opcode the opcode of the type instruction to be visited. This opcode
	 *               is either IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ,
	 *               IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE,
	 *               IF_ACMPEQ, IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
	 * @param label  the operand of the instruction to be visited. This operand is
	 *               a label that designates the instruction to which the jump
	 *               instruction may jump.
	 */
	public void visitJumpInsn(int opcode, Label label) {
		if (mv != null) {
			mv.visitJumpInsn(opcode, label);
		}
	}

	/**
	 * Visits a label. A label designates the instruction that will be visited
	 * just after it.
	 *
	 * @param label a {@link Label Label} object.
	 */
	public void visitLabel(Label label) {
		if (mv != null) {
			mv.visitLabel(label);
		}
	}

	// -------------------------------------------------------------------------
	// Special instructions
	// -------------------------------------------------------------------------

	/**
	 * Visits a LDC instruction. Note that new constant types may be added in
	 * future versions of the Java Virtual Machine. To easily detect new
	 * constant types, implementations of this method should check for
	 * unexpected constant types, like this:
	 *
	 * <pre>
	 * if (cst instanceof Integer) {
	 *     // ...
	 * } else if (cst instanceof Float) {
	 *     // ...
	 * } else if (cst instanceof Long) {
	 *     // ...
	 * } else if (cst instanceof Double) {
	 *     // ...
	 * } else if (cst instanceof String) {
	 *     // ...
	 * } else if (cst instanceof Type) {
	 *     int sort = ((Type) cst).getSort();
	 *     if (sort == Type.OBJECT) {
	 *         // ...
	 *     } else if (sort == Type.ARRAY) {
	 *         // ...
	 *     } else if (sort == Type.METHOD) {
	 *         // ...
	 *     } else {
	 *         // throw an exception
	 *     }
	 * } else if (cst instanceof Handle) {
	 *     // ...
	 * } else {
	 *     // throw an exception
	 * }
	 * </pre>
	 *
	 * @param cst the constant to be loaded on the stack. This parameter must be
	 *            a non null {@link Integer}, a {@link Float}, a {@link Long}, a
	 *            {@link Double}, a {@link String}, a {@link Type} of OBJECT or
	 *            ARRAY sort for <tt>.class</tt> constants, for classes whose
	 *            version is 49.0, a {@link Type} of METHOD sort or a
	 *            {@link Handle} for MethodType and MethodHandle constants, for
	 *            classes whose version is 51.0.
	 */
	public void visitLdcInsn(Object cst) {
		if (mv != null) {
			mv.visitLdcInsn(cst);
		}
	}

	/**
	 * Visits an IINC instruction.
	 *
	 * @param var       index of the local variable to be incremented.
	 * @param increment amount to increment the local variable by.
	 */
	public void visitIincInsn(int var, int increment) {
		if (mv != null) {
			mv.visitIincInsn(var, increment);
		}
	}

	/**
	 * Visits a TABLESWITCH instruction.
	 *
	 * @param min    the minimum key value.
	 * @param max    the maximum key value.
	 * @param dflt   beginning of the default handler block.
	 * @param labels beginnings of the handler blocks. <tt>labels[i]</tt> is the
	 *               beginning of the handler block for the <tt>min + i</tt> key.
	 */
	public void visitTableSwitchInsn(int min, int max, Label dflt,
									 Label... labels) {
		if (mv != null) {
			mv.visitTableSwitchInsn(min, max, dflt, labels);
		}
	}

	/**
	 * Visits a LOOKUPSWITCH instruction.
	 *
	 * @param dflt   beginning of the default handler block.
	 * @param keys   the values of the keys.
	 * @param labels beginnings of the handler blocks. <tt>labels[i]</tt> is the
	 *               beginning of the handler block for the <tt>keys[i]</tt> key.
	 */
	public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) {
		if (mv != null) {
			mv.visitLookupSwitchInsn(dflt, keys, labels);
		}
	}

	/**
	 * Visits a MULTIANEWARRAY instruction.
	 *
	 * @param desc an array type descriptor (see {@link Type Type}).
	 * @param dims number of dimensions of the array to allocate.
	 */
	public void visitMultiANewArrayInsn(String desc, int dims) {
		if (mv != null) {
			mv.visitMultiANewArrayInsn(desc, dims);
		}
	}

	/**
	 * Visits an annotation on an instruction. This method must be called just
	 * <i>after</i> the annotated instruction. It can be called several times
	 * for the same instruction.
	 *
	 * @param typeRef  a reference to the annotated type. The sort of this type
	 *                 reference must be {@link TypeReference#INSTANCEOF INSTANCEOF},
	 *                 {@link TypeReference#NEW NEW},
	 *                 {@link TypeReference#CONSTRUCTOR_REFERENCE
	 *                 CONSTRUCTOR_REFERENCE}, {@link TypeReference#METHOD_REFERENCE
	 *                 METHOD_REFERENCE}, {@link TypeReference#CAST CAST},
	 *                 {@link TypeReference#CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT
	 *                 CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT},
	 *                 {@link TypeReference#METHOD_INVOCATION_TYPE_ARGUMENT
	 *                 METHOD_INVOCATION_TYPE_ARGUMENT},
	 *                 {@link TypeReference#CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT
	 *                 CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT}, or
	 *                 {@link TypeReference#METHOD_REFERENCE_TYPE_ARGUMENT
	 *                 METHOD_REFERENCE_TYPE_ARGUMENT}. See {@link TypeReference}.
	 * @param typePath the path to the annotated type argument, wildcard bound, array
	 *                 element type, or static inner type within 'typeRef'. May be
	 *                 <tt>null</tt> if the annotation targets 'typeRef' as a whole.
	 * @param desc     the class descriptor of the annotation class.
	 * @param visible  <tt>true</tt> if the annotation is visible at runtime.
	 * @return a visitor to visit the annotation values, or <tt>null</tt> if
	 * this visitor is not interested in visiting this annotation.
	 */
	public AnnotationVisitor visitInsnAnnotation(int typeRef,
												 TypePath typePath, String desc, boolean visible) {
		/* SPRING PATCH: REMOVED FOR COMPATIBILITY WITH CGLIB 3.1
        if (api < Opcodes.ASM5) {
            throw new RuntimeException();
        }
        */
		if (mv != null) {
			return mv.visitInsnAnnotation(typeRef, typePath, desc, visible);
		}
		return null;
	}

	// -------------------------------------------------------------------------
	// Exceptions table entries, debug information, max stack and max locals
	// -------------------------------------------------------------------------

	/**
	 * Visits a try catch block.
	 *
	 * @param start   beginning of the exception handler's scope (inclusive).
	 * @param end     end of the exception handler's scope (exclusive).
	 * @param handler beginning of the exception handler's code.
	 * @param type    internal name of the type of exceptions handled by the
	 *                handler, or <tt>null</tt> to catch any exceptions (for
	 *                "finally" blocks).
	 * @throws IllegalArgumentException if one of the labels has already been visited by this visitor
	 *                                  (by the {@link #visitLabel visitLabel} method).
	 */
	public void visitTryCatchBlock(Label start, Label end, Label handler,
								   String type) {
		if (mv != null) {
			mv.visitTryCatchBlock(start, end, handler, type);
		}
	}

	/**
	 * Visits an annotation on an exception handler type. This method must be
	 * called <i>after</i> the {@link #visitTryCatchBlock} for the annotated
	 * exception handler. It can be called several times for the same exception
	 * handler.
	 *
	 * @param typeRef  a reference to the annotated type. The sort of this type
	 *                 reference must be {@link TypeReference#EXCEPTION_PARAMETER
	 *                 EXCEPTION_PARAMETER}. See {@link TypeReference}.
	 * @param typePath the path to the annotated type argument, wildcard bound, array
	 *                 element type, or static inner type within 'typeRef'. May be
	 *                 <tt>null</tt> if the annotation targets 'typeRef' as a whole.
	 * @param desc     the class descriptor of the annotation class.
	 * @param visible  <tt>true</tt> if the annotation is visible at runtime.
	 * @return a visitor to visit the annotation values, or <tt>null</tt> if
	 * this visitor is not interested in visiting this annotation.
	 */
	public AnnotationVisitor visitTryCatchAnnotation(int typeRef,
													 TypePath typePath, String desc, boolean visible) {
		/* SPRING PATCH: REMOVED FOR COMPATIBILITY WITH CGLIB 3.1
        if (api < Opcodes.ASM5) {
            throw new RuntimeException();
        }
        */
		if (mv != null) {
			return mv.visitTryCatchAnnotation(typeRef, typePath, desc, visible);
		}
		return null;
	}

	/**
	 * Visits a local variable declaration.
	 *
	 * @param name      the name of a local variable.
	 * @param desc      the type descriptor of this local variable.
	 * @param signature the type signature of this local variable. May be
	 *                  <tt>null</tt> if the local variable type does not use generic
	 *                  types.
	 * @param start     the first instruction corresponding to the scope of this local
	 *                  variable (inclusive).
	 * @param end       the last instruction corresponding to the scope of this local
	 *                  variable (exclusive).
	 * @param index     the local variable's index.
	 * @throws IllegalArgumentException if one of the labels has not already been visited by this
	 *                                  visitor (by the {@link #visitLabel visitLabel} method).
	 */
	public void visitLocalVariable(String name, String desc, String signature,
								   Label start, Label end, int index) {
		if (mv != null) {
			mv.visitLocalVariable(name, desc, signature, start, end, index);
		}
	}

	/**
	 * Visits an annotation on a local variable type.
	 *
	 * @param typeRef  a reference to the annotated type. The sort of this type
	 *                 reference must be {@link TypeReference#LOCAL_VARIABLE
	 *                 LOCAL_VARIABLE} or {@link TypeReference#RESOURCE_VARIABLE
	 *                 RESOURCE_VARIABLE}. See {@link TypeReference}.
	 * @param typePath the path to the annotated type argument, wildcard bound, array
	 *                 element type, or static inner type within 'typeRef'. May be
	 *                 <tt>null</tt> if the annotation targets 'typeRef' as a whole.
	 * @param start    the fist instructions corresponding to the continuous ranges
	 *                 that make the scope of this local variable (inclusive).
	 * @param end      the last instructions corresponding to the continuous ranges
	 *                 that make the scope of this local variable (exclusive). This
	 *                 array must have the same size as the 'start' array.
	 * @param index    the local variable's index in each range. This array must have
	 *                 the same size as the 'start' array.
	 * @param desc     the class descriptor of the annotation class.
	 * @param visible  <tt>true</tt> if the annotation is visible at runtime.
	 * @return a visitor to visit the annotation values, or <tt>null</tt> if
	 * this visitor is not interested in visiting this annotation.
	 */
	public AnnotationVisitor visitLocalVariableAnnotation(int typeRef,
														  TypePath typePath, Label[] start, Label[] end, int[] index,
														  String desc, boolean visible) {
		/* SPRING PATCH: REMOVED FOR COMPATIBILITY WITH CGLIB 3.1
        if (api < Opcodes.ASM5) {
            throw new RuntimeException();
        }
        */
		if (mv != null) {
			return mv.visitLocalVariableAnnotation(typeRef, typePath, start,
					end, index, desc, visible);
		}
		return null;
	}

	/**
	 * Visits a line number declaration.
	 *
	 * @param line  a line number. This number refers to the source file from
	 *              which the class was compiled.
	 * @param start the first instruction corresponding to this line number.
	 * @throws IllegalArgumentException if <tt>start</tt> has not already been visited by this
	 *                                  visitor (by the {@link #visitLabel visitLabel} method).
	 */
	public void visitLineNumber(int line, Label start) {
		if (mv != null) {
			mv.visitLineNumber(line, start);
		}
	}

	/**
	 * Visits the maximum stack size and the maximum number of local variables
	 * of the method.
	 *
	 * @param maxStack  maximum stack size of the method.
	 * @param maxLocals maximum number of local variables for the method.
	 */
	public void visitMaxs(int maxStack, int maxLocals) {
		if (mv != null) {
			mv.visitMaxs(maxStack, maxLocals);
		}
	}

	/**
	 * Visits the end of the method. This method, which is the last one to be
	 * called, is used to inform the visitor that all the annotations and
	 * attributes of the method have been visited.
	 */
	public void visitEnd() {
		if (mv != null) {
			mv.visitEnd();
		}
	}
}
